Effects of a Resistance Physical Exercise Program in Multiple Myeloma Patients

The goal of this clinical trial is to learn if physical exercise improves quality of life, frailty and mental health in patients with multiple myeloma. It will also learn about the safety and adherence of the program. The main questions it aims to answer are: Does physical exercise improves quality of life in patients with multiple myeloma? Does physical exercise improves frailty and mental health in patients with multiple myeloma? Researchers will compare supervised physical exercise and home-based unsupervised physical exercise. Participants will: Participate in one of the exercise programs, supervised or home-based, for 12 weeks. They will be completely evaluated before and after the intervention.